add timestamp to release name and tag

.github/workflows/ci.yaml

@@ -15,9 +15,14 @@ jobs:
       - name: Build
         run: make book
 
+      - name: Date
+        id: date
+        run: echo "TIMESTAMP=$(TZ='Europe/Berlin' date +'%Y.%m.%d.%H%M')" >> "$GITHUB_OUTPUT"
+
       - name: release
         uses: akkuman/gitea-release-action@v1
         with:
           files: |-
             out/*
-          name: Release
+          name: Release ${{ steps.date.outputs.TIMESTAMP }}
+          tag_name: ${{ steps.date.outputs.TIMESTAMP }}